An interesting way to think of "better" is as a combination of
"GOOD + ER," and "best" as a combination of "GOOD +
Good: (For more info, check out the "GOOD" page.)
The sign for better comes out to the right a bit.
Notice that the sign for BEST makes a much bigger movement. It actually dips down a bit for emphasis prior to moving "way up." The more you exaggerate this sign, the more your are emphasizing how much better something is than the others.